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Wang S, Li S, Rene ER, Lun X, Ma W. Design and preparation of reticular superabsorbent hydrogel material with nutrient slow-release and high shear strength for ecological remediation of abandoned mines with steep slopes. Int J Biol Macromol 2024; 270:132303. [PMID: 38744366 DOI: 10.1016/j.ijbiomac.2024.132303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 05/04/2024] [Accepted: 05/10/2024] [Indexed: 05/16/2024]
Abstract
In order to solve ecological remediation issues for abandoned mines with steep slopes, a kind of hydrogels with high cohesion and water-retaining were designed by inorganic mineral skeleton combining with polymeric organic network cavities. This eco-friendly hydrogel (MFA/HA-g-p(AA-co-AM)) was prepared with acrylic acid (AA)-acrylamide (AM) as network, which was grafted with humic acids (HA) as network binding point reinforcement skeleton and polar functional group donors, KOH-modified fly ash (MFA) as internal supporter. The maximum water absorption capacities were 1960 g/g for distilled water, which followed the pseudo-second-order model. This super water absorption was attributed to the first stage of 62 % fast absorption due to the high specific surface area, pore volume and low osmotic pressure, moreover, the multiple hydrophilic functional groups and network structure swell contributed to 36 % of the second stage slow adsorption. In addition, the pore filling of water in mesoporous channels contributed the additional 2 % water retention on the third stage. The high saline-alkali resistance correlated with the electrostatic attraction with MFA and multiple interactions with oxygen-containing functional groups in organic components. MFA and HA also enhanced the shear strength and fertility retention properties. After 5 cycles of natural dehydration and reabsorption process, these excellent characteristics of reusability and water absorption capacity kept above 97 %. The application of 0.6 wt% MFA/HA-g-p(AA-co-AM) at 15° slope could improve the growth of ryegrass by approximately 45 %. This study provides an efficient and economic superabsorbent material for ecological restoration of abandoned mines with steep slopes.
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Affiliation(s)
- Shuo Wang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Sinuo Li
- College of Agriculture and Life Sciences, Cornell University, Ithaca, NY 14850, USA
| | - Eldon R Rene
- Department of Water Supply, Sanitation and Environmental Engineering, IHE Delft Institute for Water Education, Westvest 7, 2611AX Delft, the Netherlands
| | - Xiaoxiu Lun
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Weifang Ma
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
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Jiao Y, Su T, Chen Y, Long M, Luo X, Xie X, Qin Z. Enhanced Water Absorbency and Water Retention Rate for Superabsorbent Polymer via Porous Calcium Carbonate Crosslinking. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2575. [PMID: 37764604 PMCID: PMC10536887 DOI: 10.3390/nano13182575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/10/2023] [Accepted: 09/14/2023] [Indexed: 09/29/2023]
Abstract
To improve the water absorbency and water-retention rate of superabsorbent materials, a porous calcium carbonate composite superabsorbent polymer (PCC/PAA) was prepared by copolymerization of acrylic acid and porous calcium carbonate prepared from ground calcium carbonate. The results showed that the binding energies of C-O and C=O in the O 1s profile of PCC/PAA had 0.2 eV and 0.1-0.7 eV redshifts, respectively, and the bonding of -COO- groups on the surface of the porous calcium carbonate led to an increase in the binding energy of O 1s. Furthermore, the porous calcium carbonate chelates with the -COO- group in acrylic acid through the surface Ca2+ site to form multidirectional crosslinking points, which would increase the flexibility of the crosslinking network and promote the formation of pores inside the PCC/PAA to improve the water storage space. The water absorbency of PCC/PAA with 2 wt% porous calcium carbonate in deionized water and 0.9 wt% NaCl water solution increased from 540 g/g and 60 g/g to 935 g/g and 80 g/g, respectively. In addition, since the chemical crosslinker N,N'-methylene bisacrylamide is used in the polymerization process of PCC/PAA, N,N'-methylene bisacrylamide and porous calcium carbonate enhance the stability of the PCC/PAA crosslinking network by double-crosslinking with a polyacrylic acid chain, resulting in the crosslinking network of PCC/PAA not being destroyed after water absorption saturation. Therefore, PCC/PAA with 2 wt% porous calcium carbonate improved the water-retention rate by 244% after 5 h at 60 °C, and the compressive strength was approximately five-times that of the superabsorbent without porous calcium carbonate.
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Affiliation(s)
- Yixin Jiao
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; (Y.J.); (T.S.); (X.L.); (X.X.)
| | - Tongming Su
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; (Y.J.); (T.S.); (X.L.); (X.X.)
| | - Yongmei Chen
- Guilin Zhuorui Food Ingredients Co., Ltd., Guilin 541001, China; (Y.C.); (M.L.)
| | - Minggui Long
- Guilin Zhuorui Food Ingredients Co., Ltd., Guilin 541001, China; (Y.C.); (M.L.)
| | - Xuan Luo
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; (Y.J.); (T.S.); (X.L.); (X.X.)
| | - Xinling Xie
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; (Y.J.); (T.S.); (X.L.); (X.X.)
| | - Zuzeng Qin
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; (Y.J.); (T.S.); (X.L.); (X.X.)
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Qin Z. Nanostructure Design of Catalysts: Latest Advances and Prospects. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1980. [PMID: 37446496 DOI: 10.3390/nano13131980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 06/29/2023] [Indexed: 07/15/2023]
Abstract
The recent development of nanotechnology has laid the foundation for the design and preparation of various nanostructured materials [...].
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Affiliation(s)
- Zuzeng Qin
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
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Yang L, Han F, Muhammad Y, Liu Y, Zhao Z, Kong H, Li J, Zhang H. Study on the resourceful reuse in SBS-modified asphalt of waste bagasse fibers based on green modification with tannic acid and FeOOH. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:64547-64564. [PMID: 37071364 DOI: 10.1007/s11356-023-26818-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 04/01/2023] [Indexed: 05/11/2023]
Abstract
Hydrophobic modification of bagasse fibers (BFs) through a green approach can promote its reuse in asphalt and enhance the utilization value of agricultural and forestry waste in road engineering. In contrast to traditional chemical modification, this study reports a new method for the hydrophobic modification of BFs using tannic acid (TA) and the in situ growth of FeOOH nanoparticles (NPs), resulting in FeOOH-TA-BF, which is used to prepare styrene-butadiene styrene (SBS)-modified asphalt. The experimental results show that the surface roughness, specific surface area, thermal stability, and hydrophobicity of the modified BF are improved, which is beneficial for enhancing the interface compatibility with asphalt. Specifically, compared with BF/SBS-modified asphalt, FeOOH-TA-BF/SBS-modified asphalt exhibits 39.21% and 23.26% increase in the elastic modulus G' and viscous modulus G″, respectively, at the optimal dosage of 2.5%, corresponding to 6.15-fold and 7.13-fold increase in the fatigue life at 2.5% and 5.0% strain respectively, and 22.0% improvement in shear resistance performance. In the meantime, 2.5-fold enhancement of the storage stability. Therefore, this study provides a simple, environmentally friendly, and efficient hydrophobic modification method that is of great significance for promoting the resource utilization of solid waste BF.
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Affiliation(s)
- Ling Yang
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, Guangxi, China
| | - Fuhu Han
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, Guangxi, China
| | - Yaseen Muhammad
- Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa, 25120, Peshawar, Pakistan
| | - Yu Liu
- Guangxi Communications Investment Technology Co., Ltd, Nanning, 530001, Guangxi, China
| | - Zhenxia Zhao
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, Guangxi, China
| | - Hao Kong
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, Guangxi, China
| | - Jing Li
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, Guangxi, China.
| | - Honggang Zhang
- Guangxi Key Laboratory of Road Structure and Materials, Nanning, 530007, Guangxi, China
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Sustainable alginate-carboxymethyl cellulose superabsorbents prepared by a novel quasi-cryogelation method. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-03185-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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